LAUNCHING IN JAPAN: Greeted with a heavy downpour and a swirl of Tokyo Fashion Week activity, David Lauren and his wife, Lauren Bush Lauren, hosted a party Wednesday night at the Ralph Lauren flagship on Omotesando Avenue to fete the launch of the brand’s Japanese e-commerce site. Tomoyasu Hotei, one of Japan’s most famous guitarists, performed a mini-set of tracks including his hit “Battle Without Honor or Humanity,” best known from the soundtrack for “Kill Bill,” which sent many guests into appreciative head bobbing mode.

The new Web site, ralphlauren.co.jp, features a style guide devoted to trends and signature items and houses a Japanese version of RL Magazine, a quarterly lifestyle publication. David Lauren said elements of the high-tech site will be incorporated into the brand’s other e-commerce properties in the U.S. and Europe over the next few months. “This is almost like a prototype of the future,” he said.

Bush Lauren is taking advantage of her first trip to Japan to promote her charity-focused brand Feed Projects. Before the Ralph Lauren event, she made a trip to the Rooms trade show, where Feed bags are on display. “Just the way people dress is so hip and so unique,” she said of the city. “The quality of design is just so cool.”